BA 1383 then JL 44 at Heathrow
Manchester → London → Tokyo
Timetable, London time
06:25BA 1383 from Manchester at the gate
18:30JL 44 to Tokyo leaves the gate
12 h 05 apart on the timetable
JL 44 leaves 12 h 05 after BA 1383 arrives on the timetable: more than half a day, so not a connection we count.